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Use XRRGetScreenResourcesCurrent when avail. (#801)

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* Use `XRRGetScreenResourcesCurrent` when avail.

Signed-off-by: Hal Gentz <zegentzy@protonmail.com>

* Changelog

Signed-off-by: Hal Gentz <zegentzy@protonmail.com>
This commit is contained in:
Hal Gentz
2019-03-05 18:58:14 -07:00
committed by Victor Berger
parent b682c3dfb5
commit 09182dc093
2 changed files with 9 additions and 3 deletions
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11
src/platform_impl/linux/x11/monitor.rs
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@@ -131,9 +131,14 @@ impl XConnection {
fn query_monitor_list(&self) -> Vec<MonitorHandle> {
unsafe {
let root = (self.xlib.XDefaultRootWindow)(self.display);
// WARNING: this function is supposedly very slow, on the order of hundreds of ms.
// Upon failure, `resources` will be null.
let resources = (self.xrandr.XRRGetScreenResources)(self.display, root);
let resources = if version_is_at_least(1, 3) {
(self.xrandr.XRRGetScreenResourcesCurrent)(self.display, root)
} else {
// WARNING: this function is supposedly very slow, on the order of hundreds of ms.
// Upon failure, `resources` will be null.
(self.xrandr.XRRGetScreenResources)(self.display, root)
};
if resources.is_null() {
panic!("[winit] `XRRGetScreenResources` returned NULL. That should only happen if the root window doesn't exist.");
}